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In a live broadcast on Facebook, Ivanovic said Wednesday, Dec. 28, “it was a difficult decision, but there is so much to celebrate.” The Serb won 15 tour titles, including the 2008 French Open.(AP Photo/Kamran Jebreili, file)

In a live broadcast on Facebook, Ivanovic said Wednesday, Dec. 28, “it was a difficult decision, but there is so much to celebrate.” The Serb won 15 tour titles, including the 2008 French Open.